Automatic reverse valve for stokers



Marchzv, 1934. V f qSTRQM, SR 1,952,690

V AUTOMATIC REVERSE-*"VALVE FOR sToKRs Filed Oct 3,;931

@mwj f Il//////// .1, 'ff V q 8^ I Patented Mar. 1934 I UNITED STATESAUTOMATIC REVERSE VALVE FOR STOKERS *www1-:NT OFFICE cine, Wis.

Application October 3, 1931, Serial No. 566,636 4 claims. V(c1. 1er-15s)This inventionappertains to automatic Istokers for furnaces and thelike, and more particularly to a novel reverse mechanism for the pistonof the stoker ram.

of the-primary objects of my invention is the provision of novelmeansfor automatically bringing about the reversing of the piston ram whenthe pressure acting on the piston reaches a. predetermined degree fromany cause whatsoever, such as the piston reaching the end of its stroke,or the piston beingstopped at any point in the cylinder intermediate itsstroke from lany Y Another salient object of my invention is theprovision of an improved automatic reverse valvel of the operating fluidexceeds a predetermined degree. A further important object of myinvention is the provision of an automatic reverse valve,

mechanism for the operating pistons of stokers, comprising a slidevalvebody for controlling the ilow of the operating fluid to and fromthe power cylinder, with a novel pilot valve susceptible ofA beingactuated from the pressure of the operating -iluid in the cylinder, whensaid pressure ex-V ceeds a predetermined degree, the pilot valve actingas means for controlling the automatic operation of the reverse slidevalve body.

A still further object of my invention to provide an automatic reversevalve mechanismv for thepower 'cylinder vof the operating ram of afurnace Stoker, of the above character, which will be durable'andefficient in one that willV Vbe simple and easy to manufacture and Vonewhich can be placed upon the market and incor' poratedwith aconventional low cost.

furnace stoker at a witn'thesesnd other objects in the mvention consistsin the novel construction, arrangement and formation of parts, as willbe j hereinafter more specically describediclajmed and illustrated inthe accompanying drawing, Y in which:

" Figure i is a schematic drawingA illustrating tically thendvelarrangement of the automatic valve mechanism for the power cylinderof an automatic furnace stoker, the

tion:-

portionvcf the usure beingvshown in secemLdiscs 23. Connecting thereverse valve cas- Figure 2 is a transverse sectional view through thevalve mechanism taken 'on the line 2-2 of Figure 1;

Figure 3 is a detail view of the pilot valve' Y utilized in my device,parts of the valve being shown in section. y

Referring to the drawing in detail, wherein similar referencecharacters. designate corre'- spending parts throughout the severalviews, the letter A generally indicates my improved automatic reversevalve mechanism for the power cylinder C of a furnace Stoker/(notshown).

The power cylinder C can be of any preferred lor conventionalconstruction and consists of the cylindrical body 5 having the cylinderheads 6 70 and 7 bolted or otherwise detachably secured thereto. YThecylinder head 7 carries a guide 8 for the plunger rod 9, which leads tothe ram of the Stoker andthe rod 9 can be considered as the stoker ramor plunger rod. As shown, a vsuitable stuiiing box 10 is carried by theguide 8 and sur#V rounds the plunger rod. A piston 11 is connected tothe inner end of the plunger rod 9 and is re- L ciprocatively mounted`within the cylinder 5.

Adjacent to the opposite ends of the cylinder, '89

the cylinder has communicating therewith, the. ports 12 and 13 and theseports communicate with the casing 14 of the reverse valve forming a partof my improved mechanism A"`. As shown in Figure 1, the ports 12 and 13communicate with B theK casing 14 on opposite sides of the transversecenter of the reverse valve casing. l:Elie ends of the reverse valvecasing 14 are closed by removable plugs 15 carrying the valve stops 16.Comm Vmunicating with the ends of the reverse valve casing 14 inwardlyof the' step lugs 16 are the high pressure line pipes 17 and 18 whichlead to the pilot valve casing 19, which will be more fully described.

At the transverse center of the casing 14 is ar- .ranged the inlet port20 for the high pressure pipe Iline which leads directly from thepressure pump, not shown, it being understood that oil is utilized asthe operating medium.

Reciprocatively mounted within the reverse valve casing 14 is thereverse valve body 21. This reverse valve body 21 embodies theaxiallydisposed longitudinal vextending solid portion 22 having formedthereon the end discs 23 and the spaced. intermediate enlargements 24and 25. The enlargements 24 and 25 are located on the opposite sides ofthe transverse center of the valveA body and are spaced a greaterdistance apart than the distance between said enlargements and the ing14 with the pilot valve casing 19 is a passageway 26 and this passagewayalso has communicating therewith, the high pressure inlet port` 20, aswill be later described. On each side of the central passage 26 arearranged passageways 27 and 28 which communicate respectively with there- 18 at their point of communication with the reverse valve casing.

The opposite ends of the pilot valve casing 19 can be closed byremovable plugs 30 and 31.

Connected with the plugs`30 and 31 are the liquid conduit pipes 32 and33, and these pipes have communication with one way check valves 34 and35. As shown, the check valves communicate with the passageways 12 and13 which lead to the opposite ends of the power cylinder C.

It is to be noted that the check valves 34 and 35 each embody a casing36 having a valve seat 37 on which is normally seated, the valve body38, the valve body being held on its seat by the expansion coil spring39. Reciprocatively mounted within the pilot valve casing 19 is thepilot valve proper 40. The pilot valve proper 40 includes a cylindricalsupporting rod 41 having keyed or otherwise secured to the terminalsthereof, abutment discs 42 and 43. These abutment discs 42and 43 areprovided respectively with small oil escape ports 44 and 45. I

Slidably mounted on the rod 41 is the valve body sleeve 46 and thisvalve body sleeve is conned on the rod between the abutment vdiscs 42and 43. As shown, the valve sleeve 46 is provided K with endflanges 47,and a pair of spaced intermediate annular enlargements 48 and 49.

Communicating with the passageways 27 and 28 and consequently with theinterior of the reverse valve casing 14 are outlet passageways 50 and 51which communicate with the exhaust port 53 which leads to the returnline of the pressur pump not shown.

In operation ofmy improved device, and by' referring to Figure 1, itis'to be notedlthat the oil under pressure -owing in the port 20 ofthehigh pressure line from the pump (not shown) is conned between theenlargements'24 and 25 of the reverse valve body 21, and, consequently,the oil under pressure is led through the passageway 12 intoV the powercylinder C at the left hand side thereof. This oil under pressure alsoflows through the passageway 26 around the pilot valve to the Y sitionshown in Figure 1.

sion of the spring' of the check valve 34, the' oil under pressure willow ithrough the pipe 32 and consequently this oil will act on the pilotvalve body 40, moving the same to the right. Movement of the pilot valveto the right will close the end of the pipe line 18 and open the end ofthe pipe line 17 which will, consequently, allow the now of oil underpressure from the inlet port 20, through the passageway .26, laround thepilot valve body 40, into the pipe 17 and into the reverse valve casing14 at the left hand end thereof. The pressure of the oil acting on thereverse valve body will slide the same to the right which will close.the way 12 from the high pressure port 20 and open way 13 to the highpressure port 20. Thus, the oil under pressure will be led into thepower cylinder C" at the right hand end thereof, forcing the'pston 11 tothe left hand end of the power cylinder. The oil exhausted from the lefthand end of the cylinder will ilow through port 12 around the reversevalve body 21 between one end disc 23 and the enlargement 24, into thepassageway 27, for the way 51 and out of the exhaust port 53 back to theinlet end of the pressure pump.

Particular attention is invited to the construction of the pilot valvebody and it is to be noted that when the pilot valve body is having itsposition reversed, say to the right in Figure l of the drawing, thepressure acting on the end disc 42 will slide the rod 41 and the enddisc 43. This takes place in view of the fact that pressure has beenbuilt up in the -cylinder C by the movement of the piston 1l moving tothe left, and hencev the check valve 34 is unseated. The pressure is nowgreater in pipe 32 than in pipe 33. The check valve 38 on the right-handside remains seated, and while oil remains in pipe 33, this oil is notunder the same pressure as the oil in pipe 32. This will permit theopening of the port 45 in the disc 43 and allow the seeping of the oilconine'd in the right hand end ofthe pilot valve casmg.

The reversing mechanism has been so constructed and designed as toeliminate all back pressure, oil locks and the like. Thus, it is to benoted that when the reverse valve 21 changes its position; the oil canfreely exhaust through either the pipe 171er 18, as the case may be.

'While-I have described the invention used solely for reversing thepiston at the end of its stroke, it is to be noted that the reversemechanism is so constructed that the direction of travel of the powerpiston can be reversed at any time the pressure exceeds a given degree.Thus, if the power piston should -be stopped for any reason at a pointintermediate its stroke, it is obvious that pressure will be built upwithin the power cylinder and that when this pressure relieves vthetension of the check valve spring, the flow of the oil under pressurepast the check valve will act, in the manner described, to reverse thedirection of movement of the piston.

, While I have described the use of my improved reverse valve mechanismin conjunction with automatic furance stokers it is to be understoodthat I do not want it to be confined solely to such use, and it isobvious that the improved valve mechanism can be used in connection withother operating devices.

Changes in details may be made without departing from the spirit or thescope of this invention, but what I claim as new is:

K" 1. The combination with a cylinder havingV a piston reciprocativelymounted therein, of a reverse Valve mechanism for controlling the ow ofthe uid to and from the opposite ends of the cylinder including a casingand a valve slidably mounted within the casing, a high pressure inletcommunicating with a-central portion of the valve casing, saidV valvebody including end discs and spaced intermediate enlargements, saidenlargements acting to control the 'flow of pressure from ASli the inletto the opposite ends of the. cylinder, a pilot valve mechanism includinga casing and a reciprocatory valve, the casing of the pilot valvemechanism having communication with the fluid pressure inlet at thecentral portion thereof, the reciprocatory pilot valve body having `enddiscs and spaced intermediate enlargements, feed pressure pipesconnecting the opposite ends of the reverse valve casing with the pilotvalve casing on. opposite sides of its transverse center, theenlargements of the pilot valve controlling the ow of pressurefrom thepressure inlet to said means connecting the pilot valve casing with theends of the reversev valve casing. iiuid conveying means connecting theends of the lcylinder with the ends of the pilot valve casing, and oneway spring-pressed check valves arranged in said last mentioned uidconducting means.

2. The combination with a piston having a piston reciprocatively mountedtherein, vof means for controlling the iiow of uid to and from theopposite ends ofthe cylinder including a reverse valve mechanism havinga valve casing and a reciprocatory valve 'body a pressure inlet for saidvalve casing, said body including end discs and spaced intermediateenlargements, fluid passageways connecting the opposite ends of thecylinder with the reverse valve casing on opposite sides of the pressureinlet, said enlargements controlling the flow of pressure from the inletto said passageways, a pressure outlet, passageways connecting thepressure outlet with the reverse valve casing on opposite sides of thetransverse center thereof, the reverse valve body controlling the ilowof uid from the ends of the cylinder to 'said outlet passageways, iiuidpressure means for operating the reverse valve body ineoV cluding apilot valve casing, and a pilot valve body reciprocativelymountedvtherein, said body having end discs .and spaced intermediateenlargements, iiuid pressure conveying means convsure conveying meansconnecting the pilot valve reverse valve body for controlling the iiowof uid to and from the casing, the casing having a pressure inletintermediate its ends and oppositely directed passageways on oppositesides of the inlet leading to the opposite ends of a motor cylinder, uidpressure means for automatically reversing the position of the valvebody including a `pilot valve having a casing and a reciprocatory body,fluid pressure conduit pipes communicating -valve mechanism having avalveA casing andra reciprocatory valve body, a pressure inlet for saidvalve casing, said body including end discs and spaced intermediateenlargements, iiuid passageways connecting the opposite ends of thecylinder with the reverse valve casing on opposite sides of thepressureinlet, said enlargements controlling the ow of pressure f romthe inlet to said passageways, a pressure outlet, passageways connectingthe pressure outlet with the `reverse valve casing on opposite sides-ofthe transverse center thereof, the reverse valve body controlling theii'ow of fluid from the ends of the cylinder to said outletpassagevvays, iluid pressure means for 11@ operating the reverse valvebody including a pilot valve casing, and a pilot'valve bodyreciprocatively mounted therein, said body having end discs and spacedintermediate enlargements, iiuid presbody on opposite sides of itstransverse center with the ends of the reverse valve casing, theenlargements on the pilot valve body controlling the iiow of pressurefrom the inlet to said pipe `and uid conducting pipes communicating withthe ends of the pilot valve casing and the ends of the cylinder, andspring-pressed one-way check valves in said last mentioned pipes, theend discs of the pilot valve having bleed openings therein. 125

' CLIFTON O. STROM, SB.

